Computers in Control

Software is replacing “mechanical” logic. More sophisticated schemes are possible. Simulation and optimization are possible in real time.

Example: Graphical interface for HVAC system control.

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HVAC Systems

FIGURE 14.9c

Schematic diagram of an all-air system.

FIGURE 14.9d Schematic diagram of an all-water system.

FIGURE 14.9e

Schematic diagram of an air-water system.

Air-handling unit (AHU) usually consists of: coil(s), fan(s), filter(s), air-mixing controls, humidifier, and heat recovery. The following figure represents AHU for a single zone all-air system.

REHEAT COIL FD — FLOOR DRAIN AUTOMATIC DAMPER — D / ’V ^ ML — MARINE LIGHT MANUAL DAMPER — ,— Fig. 1 Equipment Arrangement for Central Systems

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning